Lifewire on MSN
The trick that makes your mailbox talk to your house
A simple sensor inside the mailbox can cue an instant voice alert indoors ...
When smart home devices were first introduced, motion sensors were among the most interesting. This sensor would use differences in light to detect activity in a given space—impressive, but imprecise.
How-To Geek on MSN
You already own smart home sensors, even if you've never bought any
Use the signals you already have.
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